{
  "manageEntity": {
    "action": "Save",
    "entityId": "502692",
    "entityType": "Track",
    "nonce": "0x1471ead291644676417068d4c339e1f73e095e07a569283741ab621cd199752b",
    "signature": "0xa333541116e02606f6ba74aee99df09fdfe524006b4b2724b1e415e4b857d6d30f4308c993b3b3e96f1a7bc33ad8cb387ce51c18b730b8fe293e3e7a221db5591b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}